JPH0916271A - Embedded type fluid pressure adjusting device - Google Patents

Abstract

PURPOSE: To provide an embedded type fluid pressure adjusting device which is narrow in installation area and easy to inspect and adjust. CONSTITUTION: A pressure control unit U constituted by incorporating a cylindrical filter 5, a valve seat 62 for a cutoff valve, and a pilot type pressure control valve 3 integrally in a casing which has an intake 11 and an outlet 12 formed in its side part and is equipped with a lid body 2 closing an upper opening part 13 is provided so that it can freely be inserted into and extracted from the opening part 13. A valve body 61 for cutoff valve constitution which freely comes into contact with the valve seat 62 is mounted on the lid body 2, and a pilot pressure control part 4 which controls pilot pressure supplied to the pressure control valve 3 and a valve body driving part 63 which operates the valve body 61 are mounted outside the lid body 2; and a pressure introducing path L which guides the pilot pressure to the pressure control valve 3 is provided to the pressure control unit U and a supply path which supplies the pilot pressure from the pilot pressure control part 4 to the pressure introducing path L is provided to the lid body 2 so that the communication with the pressure conduction path L is intermitted as the lid body 2 is attached to the detached from the casing 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a buried type fluid pressure adjusting device.

[0002]

2. Description of the Related Art Such a buried type fluid pressure adjusting device (hereinafter may be abbreviated as a pressure adjusting device) is installed in the middle of a supply pipe for supplying a fluid such as city gas buried underground to supply the fluid. The fluid supplied at a high pressure from the source is decompressed to an appropriate pressure and buried underground. Conventionally,
The pressure adjusting device is configured as described below. The shut-off valve is constructed by integrally assembling the valve body, the valve body drive section and the valve seat, and the filter and the shut-off valve are assembled together in a state of being aligned in the fluid flow direction, and also the pressure regulating valve. And the pilot pressure controller were assembled together. Hereinafter, the filter and the shutoff valve, which are assembled together in a state of being aligned in the fluid flow direction, are a filter shutoff valve section, and the one in which the pressure adjusting valve and the pilot pressure control section are assembled together are the pressure adjusting section. It may be abbreviated. Further, a casing having two openings formed in the upper part in a state of being aligned in the flow direction of the fluid is provided in the vertical shaft in which the opening of the ground part is opened and closed by the outer lid. The filter cutoff valve portion is detachably provided in the opening portion located on the upstream side in the fluid flow direction, and the pressure adjusting portion is detachably provided in the opening portion located on the downstream side in the gas flow direction. It was

[0003]

However, in the conventional pressure adjusting device, since the filter cutoff valve portion and the pressure adjusting portion are arranged side by side in the ground direction, there is a problem that the installation area becomes wide. there were. Further, at the time of inspection or adjustment, the filter shut-off valve section and the pressure adjusting section must be separately attached and detached, and workability was poor.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an embedded type fluid pressure adjusting device which has a small installation area and is easy to inspect and adjust.

[0005]

A first characteristic configuration of a buried type fluid pressure adjusting device according to the present invention is a lid body in which an inlet and an outlet are formed in a side portion and which closes an upper opening. A pressure regulating unit is removably provided through the opening in a detachably provided casing, and the pressure regulating unit is arranged in a line in the flow direction of the fluid. A valve for a shut-off valve, which is constructed by assembling a shut-off valve-constituting valve seat located inside and a pilot pressure type pressure adjusting valve located under the filter in an integrated state, and which is in contact with the valve seat. A body is attached to the lid body, and a pilot pressure control unit that controls a pilot pressure supplied to the pressure regulating valve and a valve body drive unit that operates the valve body are provided on an outer side of the lid body. Equipped with the pie A pressure guiding path for guiding a set pressure to the pressure regulating valve is provided in the pressure regulating unit, and a supply path for supplying a pilot pressure from the pilot pressure control section to an inlet of the pressure guiding path is a cover of the lid. It is provided on the lid in a state where communication with the pressure guiding path is interrupted as the casing is attached to and detached from the casing.

A second characteristic configuration is that a receiving portion, which is pushed by the lid and into which the pressure adjusting unit is removably fitted, is provided on the inner peripheral surface of the casing.

In a third characteristic configuration, a partition wall for partitioning the inside of the casing into the inflow port side and the outflow port side is provided on the inner peripheral surface of the casing, and the partition wall is provided with the pressure regulating unit. The point is that the opening for insertion and removal and the receiving portion are formed.

In a fourth characteristic configuration, the pressure guiding passage includes a flow passage portion formed in the housing of the pressure regulating valve, and a pipe portion connected to the flow passage portion in a vertically movable state. It is provided with urging means for urging the pipe portion upward.

[0009]

The operation of the first characteristic configuration is as follows. The pressure adjustment unit is attached and detached by the following procedure. First, the lid is removed from the casing. When the lid is removed from the casing, a supply path provided in the lid is accompanied by
The communication with the pressure guiding path provided in the pressure regulating unit is cut off.
Check the pressure regulation unit through the opening of the casing with the pressure regulation unit installed in the casing. In this case, since the filter is located at the upper portion, it is possible to check the clogging state of the filter. Then, the pressure regulating unit is taken out of the casing through the opening of the casing, and the pressure regulating unit is inspected or adjusted. Subsequently, the pressure adjusting unit is inserted and installed in the casing through the opening of the casing. Then, the lid is attached to the casing. If you attach the lid to the casing,
Along with this, the valve body mounted on the lid body is arranged so as to be in contact with the valve seat of the pressure regulating unit, and the supply passage and the pressure guide passage communicate with each other to supply the pilot pressure from the pilot pressure control unit. It will be in the state of being guided to the pressure guiding path through the path. Therefore, it is not necessary to connect or disconnect the conduit for guiding the pilot pressure from the pilot pressure control section to the pressure guiding path, and to connect the pilot pressure from the pilot pressure control section to the external pressure guiding path. No need for piping.

Further, when the pressure regulating unit is installed in the casing, the noise generating pressure regulating unit is located at the lowermost portion farthest from the ground, so that the noise generated from the pressure regulating unit leaks to the ground. Can be suppressed.

The operation of the second characteristic configuration is as follows. When the lid is removed from the casing, the pressure adjusting unit can be removed from the receiving portion. When the pressure regulating unit is inserted into the casing through the opening of the casing and then the lid body is attached to the casing, the pressure regulating unit is pushed by the lid body and fitted into the receiving portion, so that the predetermined pressure is maintained in the casing. Positioned and held in position.

According to the third characteristic configuration, when the pressure regulating unit is inserted into the opening for insertion and removal of the pressure regulating unit of the partition wall, and subsequently the lid is attached to the casing, the pressure regulating unit is closed. It is pushed by the body and fitted into the receiving portion formed on the partition wall, positioned and held at a predetermined position inside the casing, and the inside of the casing is partitioned into the inlet side and the outlet side.

According to the fourth characteristic configuration, when the pressure adjusting unit is installed in the casing and the lid is attached to the casing, the pipe portion is pressed against the lid by the urging force of the urging means.

[0014]

According to the first characteristic configuration, a pressure adjusting unit in which a filter and a pressure adjusting valve are vertically arranged side by side and integrally assembled, and a lid equipped with a pilot pressure control unit and a valve body driving unit on the outside are provided. Since the body and the body are arranged side by side in the vertical direction, the installation area of the embedded type fluid pressure adjusting device can be reduced. Moreover, since the valve seat is arranged inside the filter, the vertical length of the pressure adjusting unit can be shortened, and as a result, the embedded fluid pressure adjusting device can be configured compactly. Became. Further, since the filter, the shutoff valve, the pressure adjusting valve and the pilot pressure control section can be attached and detached at once, the inspection and adjustment of the embedded fluid pressure adjusting apparatus becomes easy.

A pressure adjusting unit in which a filter, a shutoff valve, a pressure adjusting valve, and a pilot pressure control unit are all detachable at one time, but a filter, a shutoff valve-constituting valve seat, and a pressure adjusting valve are integrally assembled. And the valve body for shut-off valve construction, and the lid body equipped with the pilot pressure control unit and the valve body drive unit are separately configured, so that the weight of each is reduced and the shape is made compact, so that attachment / detachment is possible. I made it easy. Also, when the lid is removed from the casing, the pressure adjusting unit can be inspected through the opening of the casing with the pressure adjusting unit installed in the casing. Can be inspected without removing it from the casing. Therefore, in that case, only when the filter needs to be replaced, the pressure adjusting unit can be taken out of the casing and the filter can be replaced. Further, if the filter is detachable even when the pressure adjusting unit is installed in the casing, only the filter can be taken out for inspection or replacement.

Although the pressure adjusting unit and the lid are separately provided, the lid is provided with a supply passage for supplying the pilot pressure from the pilot pressure control section to the inlet of the pressure guiding passage, and the lid is attached and detached. Since the communication between the supply path and the pressure guiding path is automatically interrupted, a pipe for guiding the pilot pressure from the pilot pressure control section to the pressure guiding path when the lid is attached or detached. No need to connect or disconnect the road, so inspection and adjustment is easy. Further, since the external pipe for guiding the pilot pressure from the pilot pressure control section to the pressure guiding path is not required, the structure can be simplified. By the way, a pressure regulating unit in which a filter, a valve seat for shutoff valve construction and a pressure regulating valve are assembled in an integrated state, and a lid body equipped with a valve body for shutoff valve construction, a pilot pressure control section and a valve body drive section. Is assumed to be assembled in an integrated state, but in this case, since the weight becomes heavy and the shape becomes large, the attachment and detachment becomes troublesome. Further, even in the case of checking only the clogged state of the filter, it must be taken out from the casing once.

Further, since it is possible to suppress the noise generated from the pressure adjusting unit from leaking to the ground, it is possible to improve the noise countermeasure.

According to the second characteristic configuration, when the pressure regulating unit is attached to or detached from the casing, it is unnecessary to hold or release the pressure regulating unit in the casing. Checking and adjusting mold fluid pressure regulators has become easier.

According to the third characteristic configuration, the partition wall for partitioning the inside of the casing into the inlet side and the outlet side is utilized to form the receiving portion for positioning and holding the pressure regulating unit in the casing. Therefore, the structure of the buried type fluid pressure adjusting device can be simplified.

According to the fourth characteristic configuration, since the tube portion is pressed against the lid by the urging force of the urging means, the supply passage and the pressure guiding passage communicate with each other regardless of thermal expansion and contraction due to temperature change. The state can be maintained reliably, and the reliability of the buried type fluid pressure adjusting device can be improved.

[0021]

Embodiments of the present invention will be described below with reference to the drawings. As shown in FIG. 7, the pressure adjusting device R is installed in the middle of the supply pipe K for supplying city gas or the like buried in the ground, and the city gas supplied from the primary-side inlet 11 at high pressure is properly supplied. The pressure is adjusted to be reduced, and the pressure is discharged from the outlet 12 on the secondary side. In the pit P, the pressure adjusting device R is in a state where the lid body 2 portion is located in the pit P.
Substantially the entire casing 1 part is directly buried in the ground.
A supply pipe K on the upstream side of the pressure adjusting device is provided with an inflow side valve Vi, and a supply pipe K on the downstream side of the pressure adjusting device R is provided with an outflow side valve Vo. These valves Vi and Vo are buried in the ground with the opening / closing operation section located in the pit P. C in the figure is a pit P
It is an outer lid that opens and closes the opening of the ground portion of.

First, a schematic structure of the pressure adjusting device R will be described with reference to FIGS. Pressure regulator R
Is a casing 1 in which an inlet 11 and an outlet 12 are formed on the sides and a lid 2 that detachably closes an upper opening 13 is detachably attached, and as a pilot pressure type pressure control valve for adjusting the outflow pressure. The governor 3, the pilot pressure control unit 4 that controls the pilot pressure supplied to the governor 3, the filter 5,
The emergency shutoff valve 6 is closed as a main component to close the gas supply when the outflow pressure becomes abnormally high pressure or abnormally low pressure. The governor 3 is configured to adjust the outflow pressure based on the pilot pressure introduced from the pilot pressure control unit 4.

A vertically oriented cylindrical filter 5 arranged side by side in the direction of fluid flow, a valve seat 62 for constructing an emergency shutoff valve located inside the filter 5, and a governor 3 located below the filter 5. Are assembled in an integrated state to form a pressure adjusting unit U. And the pressure regulating unit U
Is provided in the casing 1 through the opening 13 so as to be freely inserted and removed. A valve body 61 for contacting the valve seat 62 for an emergency shutoff valve is mounted on the inner side of the lid body 2, and a pilot pressure control unit 4 and a valve body drive unit 63 for operating the valve body 61 are installed. , Is provided on the outer side of the lid 2. A pilot pressure guiding path L for guiding the pilot pressure from the pilot pressure controlling section 4 to the governor 3 is provided in the pressure adjusting unit U, and the pilot pressure from the pilot pressure controlling section 4 is introduced to the inlet of the pilot pressure guiding path L. The pilot pressure supply passage M to be supplied is provided in the lid body 2 in a state where communication with the pilot pressure guiding passage L is interrupted as the lid body 2 is attached to and detached from the casing 1. Further, the pressure regulating unit U is provided with a primary pressure guiding pipe 78 for supplying a primary pressure for control to the pilot pressure control unit 4.

Hereinafter, each component will be described.
First, the pressure adjusting unit U will be described. First, the governor 3 of the pressure adjusting unit U will be described. The governor 3 includes a substantially cylindrical governor casing 31 having a small diameter portion 31a and a large diameter portion 31b, and a tubular first diaphragm holder 32 coaxially positioned in the large diameter portion 31b of the governor casing 31. , A second diaphragm holding body 33 which is provided with a cylindrical portion 33a and is located in the large diameter portion 31b coaxially with the governor casing 31, and is sandwiched between the first diaphragm holding body 32 and the second diaphragm holding body 33. The flexible diaphragm 34 thus provided and the second diaphragm holding member 33 are movable in the axial direction by the guide of the inner peripheral surface of the cylindrical portion 33a of the second diaphragm holding body 33 and are in contact with the diaphragm 34 while holding the second diaphragm. The piston body 35 attached to the body 33, the spring 36 for urging the piston body 35 toward the diaphragm 34, and the large size of the governor casing 31. Attached by a plurality of bolts 38 to the opening end surface parts 31b, are composed of a casing cover 37 for holding the first diaphragm holder 32 and the second diaphragm holder 33 in the large diameter portion 31b.

A pilot pressure chamber 39 is defined by the diaphragm 34, the second diaphragm holder 33, and the casing cover 37.

The first diaphragm holder 32 is provided with a frustoconical side wall 32a, and the frustoconical side wall 32a is provided with a large number of through holes 32b which are long in the axial direction along the circumferential direction. Is formed over the entire circumference. The diaphragm 34 is arranged so as to face the inner peripheral surface of the truncated conical side wall portion 32a.

An annular protrusion 31c is formed on the outer peripheral surface of the governor casing 31. In addition, the governor casing 3
On the side wall of the large diameter portion 31b of No. 1, the pressure guiding hole 31d opened to the upper end surface of the annular protrusion 31c and the open end surface of the large diameter portion 31b.
Is formed. In addition, the large diameter portion 3 of the governor casing 31
The side wall 1b has a flow opening 3 that opens inside and outside the casing.
1e is formed. Further, a pressure guiding hole 31f opening to the inside and outside of the casing is formed in the vertical middle portion of the side wall of the small diameter portion 31a of the governor casing 31. The casing cover 37 is formed with a pressure guide hole 37 a opening to the upper end surface and the pilot pressure chamber 39. Then, when the casing cover 37 is attached to the opening end surface of the large diameter portion 31b of the governor casing 31, the opening portion of the pressure guiding hole 31d and the pressure guiding hole 3 are attached.
The opening of 7a is opposed to the pressure guiding hole 31d, the pressure guiding hole 37a, and the pilot pressure chamber 39 so as to communicate with each other in series. That is, the governor casing 31 and the casing cover 37 constitute the housing of the governor 3, and the pressure guiding hole 31d is connected in series.
The pressure guiding hole 37a is configured to function as a flow path portion of the pilot pressure guiding path L as described later.

Next, the structure in which the filter 5, the valve seat 62 for constructing the emergency shutoff valve, and the filter 5 are integrally assembled will be described. The filter 5 is formed in a cylindrical shape whose inner diameter is larger than the outer diameter of the small diameter portion 31 a of the governor casing 31. The upper and lower filter holders 71 and 72 are connected by a plurality of rod-shaped bodies 73, and the lower filter holder 72 is attached to the upper end surface of the annular protrusion 31c of the governor casing 31 with a plurality of bolts 85. The upper filter holder 71 is located above the upper end of the small diameter portion 31 a of the governor casing 31. Then, the filter 5 is mounted on the annular protrusion 31 c of the governor casing 31 in a state of being fitted onto the upper and lower filter holders 71 and 72. Therefore, the filter 5 is the filter holder 7
It is movable up and down with respect to 1, 72. A valve seat 62 for configuring the emergency shutoff valve is located inside the filter 5,
It is attached to the upper end opening of the small diameter portion 31 a of the governor casing 31. The filter 5 is attached to the filter holders 71 and 72.
With the filter 5 and the governor casing 31 fitted to the outside.
A gap is formed between the gap and the gap so that dust or the like can be collected in this gap. Therefore, by any chance filter 5
Even if is damaged, it is possible to prevent dust and the like from collecting in this gap and flowing to the valve seat 62 and the governor 3 for the emergency shutoff valve, and prevent damage to the valve seat 62 and the governor 3.

The structure for connecting the filter holders 71 and 72 with a plurality of rod-shaped members 73 will be described. Rod 7
Each of both ends of 3 is provided with a small diameter portion 73a, and a male screw portion is formed in the upper small diameter portion 73a.
Then, the lower small diameter portion 73a is inserted into the recess 72a of the filter holder 72, and as shown in FIG. 4, the upper small diameter portion 73a is connected to the upper end surface of the large diameter portion 73b and the lower surface of the filter holder 71. A plurality of disc springs 74 are inserted between the two, and inserted into the holes 71a of the filter holder 71, and the nut 75 is screwed to the male screw portion of the upper small diameter portion 73a.

Next, the pilot pressure guiding passage L provided in the pressure adjusting unit U will be described. The pilot pressure guiding tube 76 having the small diameter portion 76a at the lower end is inserted into the hole 71b formed at the upper end of the filter holding body 71 at the upper end, and as shown in FIG. Large diameter part 76b
With a plurality of disc springs 77 interposed between the lower end surface of the filter holder 72 and the upper end surface of the lower filter holder 72, the hole 72b of the filter holder 72 and the pressure guide hole 31d of the governor casing 31 are provided.
It is inserted in the upper end opening of the and is movably provided in the vertical direction. That is, the pilot pressure guiding passage L is formed by the flow passage portions 31 d, 37 formed in the housings 31, 37 of the governor 3.
a, and the flow path portions 31d and 37a in a vertically movable state.
Pilot pressure guiding pipe 76 as a pipe portion connected to and communicated with
It is configured with.

Next, the primary pressure guiding tube 78 provided in the pressure adjusting unit U will be described. A primary pressure guiding tube 78 having a lower end bent at a substantially right angle is fitted into the hole 71c of the filter holding body 71 at the upper end thereof, and the bent lower end is fitted into the pressure guiding hole 31f of the governor casing 31. It is fitted inside and provided.

Next, the casing 1 will be described. A horizontal partition wall 14 for partitioning the primary chamber 15 on the inlet 11 side and the secondary chamber 16 on the outlet 12 side is provided in the vertical middle portion of the inner peripheral surface of the casing 1, and the partition wall 14 is An opening 17 for inserting and removing the pressure unit U is formed. Then, by forming the opening 17 for insertion / removal, the partition wall 14 having a shape protruding in an annular shape from the inner peripheral surface of the casing 1 is pressed by the lid body 2 as will be described later. It is configured to function as a receiving portion D into which the unit U is removably fitted. An upward concave portion is formed in the upper portion of the partition wall 14 so that dust can be collected in the concave portion. Further, the side wall portion of the casing 1 is opened at its side surface and upper end surface,
A hole 18 is formed.

Next, the lid 2 will be described. The lid 2 has four holes 21, 22, 23, 2 penetrating vertically.
4 is formed. When the pilot pressure control unit 4 is attached to the outer side of the lid body 2, the upper opening of the hole 21 is the secondary pressure introducing port 41 of the pilot pressure control unit 4, and the upper opening of the hole 22 is the pilot pressure feeding port. 42 and the upper opening of the hole 23 are located so as to face the primary pressure introducing port 43, respectively. When the cover 2 is attached to the casing 1, the lower surface opening of the hole 21 is the upper surface opening of the hole 18 of the casing 1, and the lower surface opening of the hole 22 is the pilot pressure guiding pipe 7
The upper opening of 6 and the lower opening of the hole 23 are located so as to face the upper opening of the primary pressure guiding tube 78.

As will be described later, the holes 18 and 21 communicating in series function as a secondary pressure supply passage for supplying a secondary pressure for control to the pilot pressure control section 4. Also, the hole 22
As described below, the pilot pressure control unit 4 functions as a pilot pressure supply passage M for supplying the pilot pressure to the inlet of the pilot pressure guiding passage L. Further, the hole 23 functions as a primary pressure supply passage for supplying a primary pressure for control to the pilot pressure control section 4, as described later. Further, the hole 24 is used for inserting a valve rod 64 that connects the valve body 61 of the emergency shutoff valve 6 and the valve body drive portion 63.

Next, the pilot pressure control section 4 will be described. The pilot pressure controller 4 is attached to the outer side of the lid 2. Along with this, the secondary pressure introduction port 41 is provided in the hole 21 as the secondary pressure supply path, and the pilot pressure delivery port 42 is provided.
Is connected to the hole 22 serving as the pilot pressure supply passage M, and the primary pressure introducing port 43 is connected to the hole 23 serving as the primary pressure supply passage. In addition, the hole 18 that functions as a secondary pressure supply passage
As shown in FIGS. 1 and 7, a control secondary pressure supply pipe 79 that supplies secondary pressure to the pilot pressure control unit 4 by deriving the secondary pressure from the downstream side of the outflow valve Vo is provided in the side opening of the. Connected for communication. Further, a secondary pressure sending-out port 44 for branching and sending out the control secondary pressure introduced from the secondary pressure introducing port 41 is provided.

Next, the emergency shutoff valve 6 will be described. The valve body drive unit 63 is attached to the outer side of the lid body 2, and the upper end portion of the valve rod 64 inserted into the hole 24 of the lid body 2 is attached to the valve body drive unit 6.
3, and a valve element 61 is attached to the lower end. still,
Reference numeral 65 in the figure is a spring for urging the valve body 61 downward. In addition, as shown in FIGS. 1 and 7, the other end of the monitoring secondary pressure supply pipe 80, one end of which is connected to the secondary pressure outlet 44 of the pilot pressure control unit 4, is connected to the valve body drive unit 63. The secondary pressure supplied to the pilot pressure control unit 4 is branched through the secondary pressure supply pipe 79, and the branched secondary pressure is used as the secondary pressure for monitoring. It is configured to be introduced through 80 to actuate the valve body drive portion 63.

Reference numeral 81 in the drawing denotes an O-ring which closely adheres to the upper end surface of the casing 1 and the lower surface of the lid 2 to seal between them, and 82 denotes an inner peripheral surface of the annular partition wall 14 of the casing 1. It is an O-ring that is in close contact with the outer peripheral surface of the governor casing 31 of the pressure regulating unit U and seals between them. Also, 8
Reference numeral 3 is a positioning pin for positioning the pressure adjusting unit U at a predetermined position with respect to the casing 1 when the pressure adjusting unit U is mounted in the casing 1.

Next, a procedure for mounting the pressure regulating unit U in the casing 1 and a procedure for removing it from the casing 1 will be described. First, a procedure for mounting the pressure adjusting unit U in the casing 1 will be described. The pressure regulating unit U is inserted into the casing 1 through the opening 13 of the casing 1, and the lower portion thereof is inserted into the opening 17 of the partition wall 14. Then, the governor casing 31 is positioned in the opening 1 with the positioning pin 83 positioned.
It fits inside 7. Then, the lid 2 is attached to the opening 13 of the casing 1 by a plurality of screw-type tightening portions 84. Accordingly, the filter holder 7 above the pressure adjusting unit U
When 1 touches the lower surface of the lid body 2, the pressure adjusting unit U is pushed downward, and the annular protrusion 31c becomes the partition wall 14.
The pressure regulating unit U is positioned and held at a predetermined position in the casing 1 by being pressed against and engaged with. or,
The upper end opening of the pilot pressure guiding tube 76 is the hole 22 of the lid 2.
The pilot pressure guiding passage L and the hole 22 serving as the pilot pressure supply passage M are connected to be in contact with each other so as to face the lower opening of the primary pressure guiding tube 78, and the upper end opening of the primary pressure guiding pipe 78 is a lid. Abut on the lower surface opening of the hole 23 of No. 2,
The primary pressure guiding tube 78 and the hole 23 as a primary pressure supply path are connected and connected. Further, the upper surface opening of the hole 18 of the casing 1 is brought into contact with the lower surface opening of the hole 21 of the lid 2 so as to be in contact with each other, so that the hole 18 and the hole 21 are connected in series. Further, the valve body 61 attached to the lid body 2 is arranged so as to be in contact with the valve seat 62 attached to the pressure adjusting unit U.

Further, the lid 2 is attached to the opening 13 of the casing 1.
The upper filter holding body 71 is pressed downward by the lid body 2 when it is attached to the disc spring 74, and the disc spring 74 is compressed. Since the annular projection 31c is pressed against the partition wall 14, the pressure regulating unit U can be reliably held in the casing 1 regardless of thermal expansion and contraction due to temperature change. Further, the disc spring 77 is also compressed, and the urging force presses the pilot pressure guiding pipe 76 against the lid body 2. Therefore, regardless of the thermal expansion and contraction due to the temperature change, the pilot pressure guiding pipe 76 can be connected to the upper end opening portion of the pilot pressure guiding pipe 76. It is possible to reliably maintain the seal of the contact portion with the lower surface opening of the hole 22 of the lid body 2.

Further, the casing 1, the lid body 2, the filter 5, the governor casing 31, the filter holding body 71, and the casing 1, due to the temperature change by the urging force of the disc springs 74 and 77.
Since the difference in thermal expansion and the difference in thermal contraction of 72, the rod-shaped body 73, the pilot pressure guiding tube 76, etc. can be absorbed, the dimensional accuracy of them can be suppressed to a low level, and the processing cost can be reduced.

That is, using the partition wall 14, the lid 2
A receiving portion D is formed by which the pressure adjusting unit U is fitted into the pressure adjusting unit so that the pressure adjusting unit U can be inserted and removed freely. Further, the disc spring 77 corresponds to a biasing means that biases the pilot pressure guiding pipe 76, which is a pipe portion of the pilot pressure guiding passage L, upward.

Next, a procedure for removing the pressure adjusting unit U from the inside of the casing 1 will be described. Screw type tightening part 84
Of the cover 2 to release the lid 2 from the opening 13 of the casing 1.
Remove from Along with that, communication between the pilot pressure introducing passage L and the hole 22 as the pilot pressure supply passage M, and
The communication between the primary pressure guiding tube 78 and the hole 23 as the primary pressure supply path is cut off. When the pressure regulating unit U is pulled up, the fitting between the pressure regulating unit U and the partition wall 14 is released, and the pressure regulating unit U can be taken out of the casing 1 through the opening 13 of the casing 1. . When the casing cover 37 is removed from the governor casing 31 by removing the bolts 38, the first diaphragm holding body 32 and the second diaphragm holding body 33 that support the diaphragm 34, the piston body 35 and the like are removed from the governor casing 31.
The governor 3 can be easily inspected and adjusted because it can be taken out from the machine and disassembled.

The filter 5 is replaced by the filter holders 71, 7
By inserting / removing the pressure regulating unit U into the casing 1, the filter 5 alone can be attached / detached. Therefore, when inspecting only the filter 5, the pressure regulating unit U can be removed. Only the filter 5 can be taken out and inspected or exchanged with the one installed in 1.

That is, the supply passage M (hole 22) for supplying the pilot pressure from the pilot pressure control section 4 to the inlet of the pressure guide passage L is attached to and detached from the casing 1 of the lid body 2 by the pressure guide passage L. It is provided on the lid body 2 in a state where communication with and is interrupted.

Next, the operation of the buried type fluid pressure adjusting device configured as described above will be described. First, governor 3
The operation of the pilot pressure control unit 4 will be described. The high-pressure primary-side gas flowing from the primary-side inlet 11 is
In FIG. 2, the governor casing 31 of the pressure regulating unit U passes through the filter 5 as indicated by a solid arrow.
Flows into the governor 3 through the upper end opening of the. Then, the gas on the secondary side, which has been decompressed and adjusted to a predetermined pressure by the governor 3, flows out through the flow opening 31e of the governor casing 31 as shown by a broken arrow in FIG. Out of the outlet 12.

In the governor 3, the pilot pressure controlled by the pilot pressure control unit 4 controls the contact area of the diaphragm 34 with the frustoconical side wall portion 32a, so that the opening area of the flow hole 32b is reduced. The gas pressure on the secondary side is adjusted to be reduced. In the governor 3, the primary pressure is applied to the upper surface of the diaphragm 34, as shown by the solid arrow in FIG. Further, the pilot pressure controlled by the pilot pressure control unit 4 is as shown in FIG.
As indicated by an alternate long and short dash line in the figure, the pilot pressure is delivered from the pilot pressure outlet 42 and sequentially introduced through the hole 22, the pilot pressure guiding pipe 76, the pressure guiding hole 31d and the pressure guiding hole 37a, and introduced into the pilot pressure chamber 39. And the diaphragm 34
Applied to the underside of.

The control primary pressure is applied to the pressure guiding hole 31f of the governor casing 31, the primary pressure guiding tube 78, and the hole 2 of the lid 2.
3 is sequentially introduced to the pilot pressure control section 4 through the primary pressure introduction port 43. Further, the control secondary pressure is introduced into the pilot pressure control section 4 from the secondary pressure introduction port 41 through the control secondary pressure supply pipe 79 and the holes 18 and 21 in order. The pilot pressure is controlled based on the control primary pressure and the control secondary pressure. When the control secondary pressure is higher than the set pressure, the pilot pressure is a pressure that maintains the state in which the diaphragm 34 fully closes the flow hole 32b as shown in FIG. Abbreviated). The pilot pressure is controlled to be lower than the fully closed state maintaining pressure as the control secondary pressure becomes lower than the set pressure. As the pilot pressure decreases, the diaphragm 34 is pushed toward the pilot pressure chamber 39 side, so that the opening area of the flow hole 32b increases. FIG. 6 shows a state in which the diaphragm 34 is pushed toward the pilot pressure chamber 39 side and a part of the flow passage hole 32b is opened. Therefore, the gas on the primary side passes through the opening of the flow hole 32b and flows out to the secondary side.

Next, the operation of the emergency shutoff valve 6 will be described. When the monitoring secondary pressure introduced through the monitoring secondary pressure supply pipe 80 is within the set range, the valve body driving unit 63 resists the valve body 61 from the valve seat 62 against the biasing force of the spring 65. Holds apart. When the secondary pressure for monitoring is out of the set range, the valve body drive unit 63 releases the holding of the valve body 61, and therefore the urging force of the spring 65 causes the valve body 6 to be released.
Since 1 contacts the valve seat 62 and closes the valve, the gas supply to the secondary side is cut off. In addition, the pressure guide hole 31f for the primary pressure for control is used.
Is provided on the downstream side of the valve seat 62 of the emergency cutoff valve 6 in the gas flow direction, so that when the emergency cutoff valve 6 is closed, the supply of the control primary pressure to the pilot pressure control unit 4 can also be cut off. it can.

Another Embodiment Next, another embodiment will be described. The relative positional relationship between the inflow port 11 and the outflow port 12 when the inflow port 11 and the outflow port 12 are formed on the side of the casing 1 can be variously changed. For example, in a plan view, the relative axes of the inflow port 11 and the outflow port 12 are located on the same line, relative positions in which they are parallel,
Alternatively, they can be formed in a relative positional relationship where they intersect.

Either the inflow port 11 or the outflow port 12 may be formed at the bottom of the casing 1.

In the above embodiment, the case where the partition wall 14 is used to form the receiving portion D which is pushed by the lid body 2 and into which the pressure adjusting unit U is removably fitted is exemplified.
Alternatively, the partition wall 14 and the receiving portion D may be provided separately. For example, the receiving portion D may be provided on the inner peripheral surface of the bottom portion of the casing 1.

It should be noted that reference numerals are added to the claims for convenience of comparison with the drawings, but the present invention is not limited to the structures of the accompanying drawings by the entry.

[Brief description of the drawings]

FIG. 1 is an exploded vertical sectional side view of a buried type fluid pressure adjusting device.

FIG. 2 is a vertical sectional side view of a buried type fluid pressure adjusting device.

FIG. 3 is a view on arrow EE in FIG.

FIG. 4 is a vertical cross-sectional side view of a main part of a buried type fluid pressure adjusting device.

FIG. 5 is a vertical cross-sectional side view of a main part of a buried type fluid pressure adjusting device.

FIG. 6 is a vertical cross-sectional side view of a governor portion of an embedded fluid pressure regulator.

FIG. 7 is a vertical cross-sectional side view showing an installed state of a buried type fluid pressure adjusting device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Casing 2 Lid body 3 Pressure regulating valve 4 Pilot pressure control unit 5 Filter 11 Inlet port 12 Outlet port 13 Opening part 14 Partition wall 17 Opening / closing part for opening and closing 31,37 Housing 61 Valve body 62 Valve seat 63 Valve body drive part 74 urging means 76 pipe parts 31d, 37a flow path part D receiving part L pressure guiding path M supply path U pressure adjusting unit

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Kiyoshi Imai 2-23-1 Hatchobori, Chuo-ku, Tokyo Japan Fushiya Co., Ltd. (72) Inventor Hiroki Matsuno 2-23-1, Hatchobori, Chuo-ku, Tokyo Japan Fushiya Japan Co., Ltd. (72) Inventor Hideki Taguchi 2-3-11 Sellohori, Nishi-ku, Osaka-shi, Osaka Prefecture Kyosei Co., Ltd.

Claims (4)

[Claims] 1. A casing (1) in which a flow inlet (11) and a flow outlet (12) are formed on a side portion and a lid (2) for closing an upper opening (13) is detachably provided. A pressure regulating unit (U) is removably provided through the opening (13), and the pressure regulating unit (U) is arranged in the flow direction of the fluid and has a cylindrical filter (5) in a vertical posture. ), A valve seat (62) for the construction of the shut-off valve located inside the filter (5),
And a valve body (6) for constructing a shutoff valve, which is constructed by integrally assembling a pilot pressure type pressure regulating valve (3) located under the filter (5), and which is in contact with the valve seat (62).
1) is mounted on the lid body (2) and operates a pilot pressure control section (4) for controlling pilot pressure supplied to the pressure regulating valve (3) and the valve body (61). A valve body driving part (63) is provided on the outer side of the lid body (2), and a pressure guiding path (L) for guiding the pilot pressure to the pressure regulating valve (3) is provided with the pressure regulating unit (U). ), Which supplies the pilot pressure from the pilot pressure control section (4) to the inlet of the pressure guiding path (L) with respect to the casing (1) of the lid body (2). An embedded fluid pressure adjusting device provided on the lid body (2) in a state where communication with the pressure guiding path (L) is interrupted in association with attachment and detachment. 2. A receiving portion (D), which is pushed by the lid (2) and into which the pressure adjusting unit (U) is removably fitted, is provided on an inner peripheral surface of the casing (1). Claim 1
The buried type fluid pressure regulator described. 3. A partition wall (14) for partitioning the inside of the casing (1) into the inlet (11) side and the outlet (12) side is provided on an inner peripheral surface of the casing (1), The embedded pressure adjusting device according to claim 2, wherein the partition wall (14) is provided with an opening (17) for inserting and removing the pressure adjusting unit (U) and the receiving portion (D). . 4. The pressure guiding passage (L) is movable in the vertical direction together with the flow passage portions (31d) and (37a) formed in the housings (31) and (37) of the pressure regulating valve (3). In this state, a biasing means (74) for biasing the pipe portion (76) upward is constructed by including a pipe portion (76) which is connected to the flow passage portions (31d) and (37a).
The embedded pressure regulator according to claim 1, 2 or 3, further comprising: